You need to register with the ottawabikes website to post classified items. Once registered, you will see a button at the bottom "Create New Post." Use this to add your stuff to the list. If your item sells, just mark it as sold in a follow up post. Or, if you want me to remove it, send an email. 

Also, if you post something for sale, beware of suspicious offers. Best option is to deal locally with people you can meet in person. Check out some of these helpful anti-scam tips from craigslist.